Commit | Line | Data |
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e4f2379d AB |
1 | /* |
2 | * Copyright (C) 2004-2013 Synopsys, Inc. (www.synopsys.com) | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License version 2 as | |
6 | * published by the Free Software Foundation. | |
7 | * | |
8 | * Driver for the ARC EMAC 10100 (hardware revision 5) | |
9 | * | |
10 | * Contributors: | |
11 | * Amit Bhor | |
12 | * Sameer Dhavale | |
13 | * Vineet Gupta | |
14 | */ | |
15 | ||
775dd682 | 16 | #include <linux/crc32.h> |
e4f2379d AB |
17 | #include <linux/etherdevice.h> |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/io.h> | |
20 | #include <linux/module.h> | |
21 | #include <linux/of_address.h> | |
22 | #include <linux/of_irq.h> | |
23 | #include <linux/of_mdio.h> | |
24 | #include <linux/of_net.h> | |
25 | #include <linux/of_platform.h> | |
26 | ||
27 | #include "emac.h" | |
28 | ||
74dd40bc BG |
29 | /** |
30 | * arc_emac_tx_avail - Return the number of available slots in the tx ring. | |
31 | * @priv: Pointer to ARC EMAC private data structure. | |
32 | * | |
33 | * returns: the number of slots available for transmission in tx the ring. | |
34 | */ | |
35 | static inline int arc_emac_tx_avail(struct arc_emac_priv *priv) | |
36 | { | |
37 | return (priv->txbd_dirty + TX_BD_NUM - priv->txbd_curr - 1) % TX_BD_NUM; | |
38 | } | |
39 | ||
e4f2379d AB |
40 | /** |
41 | * arc_emac_adjust_link - Adjust the PHY link duplex. | |
42 | * @ndev: Pointer to the net_device structure. | |
43 | * | |
44 | * This function is called to change the duplex setting after auto negotiation | |
45 | * is done by the PHY. | |
46 | */ | |
47 | static void arc_emac_adjust_link(struct net_device *ndev) | |
48 | { | |
49 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
01dea536 | 50 | struct phy_device *phy_dev = ndev->phydev; |
e4f2379d AB |
51 | unsigned int reg, state_changed = 0; |
52 | ||
53 | if (priv->link != phy_dev->link) { | |
54 | priv->link = phy_dev->link; | |
55 | state_changed = 1; | |
56 | } | |
57 | ||
58 | if (priv->speed != phy_dev->speed) { | |
59 | priv->speed = phy_dev->speed; | |
60 | state_changed = 1; | |
6eacf311 RP |
61 | if (priv->set_mac_speed) |
62 | priv->set_mac_speed(priv, priv->speed); | |
e4f2379d AB |
63 | } |
64 | ||
65 | if (priv->duplex != phy_dev->duplex) { | |
66 | reg = arc_reg_get(priv, R_CTRL); | |
67 | ||
663713eb | 68 | if (phy_dev->duplex == DUPLEX_FULL) |
e4f2379d AB |
69 | reg |= ENFL_MASK; |
70 | else | |
71 | reg &= ~ENFL_MASK; | |
72 | ||
73 | arc_reg_set(priv, R_CTRL, reg); | |
74 | priv->duplex = phy_dev->duplex; | |
75 | state_changed = 1; | |
76 | } | |
77 | ||
78 | if (state_changed) | |
79 | phy_print_status(phy_dev); | |
80 | } | |
81 | ||
e4f2379d AB |
82 | /** |
83 | * arc_emac_get_drvinfo - Get EMAC driver information. | |
84 | * @ndev: Pointer to net_device structure. | |
85 | * @info: Pointer to ethtool_drvinfo structure. | |
86 | * | |
87 | * This implements ethtool command for getting the driver information. | |
88 | * Issue "ethtool -i ethX" under linux prompt to execute this function. | |
89 | */ | |
90 | static void arc_emac_get_drvinfo(struct net_device *ndev, | |
91 | struct ethtool_drvinfo *info) | |
92 | { | |
23d2d9a6 RP |
93 | struct arc_emac_priv *priv = netdev_priv(ndev); |
94 | ||
95 | strlcpy(info->driver, priv->drv_name, sizeof(info->driver)); | |
96 | strlcpy(info->version, priv->drv_version, sizeof(info->version)); | |
e4f2379d AB |
97 | } |
98 | ||
99 | static const struct ethtool_ops arc_emac_ethtool_ops = { | |
e4f2379d AB |
100 | .get_drvinfo = arc_emac_get_drvinfo, |
101 | .get_link = ethtool_op_get_link, | |
4694e6e3 PR |
102 | .get_link_ksettings = phy_ethtool_get_link_ksettings, |
103 | .set_link_ksettings = phy_ethtool_set_link_ksettings, | |
e4f2379d AB |
104 | }; |
105 | ||
106 | #define FIRST_OR_LAST_MASK (FIRST_MASK | LAST_MASK) | |
107 | ||
108 | /** | |
109 | * arc_emac_tx_clean - clears processed by EMAC Tx BDs. | |
110 | * @ndev: Pointer to the network device. | |
111 | */ | |
112 | static void arc_emac_tx_clean(struct net_device *ndev) | |
113 | { | |
114 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 115 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
116 | unsigned int i; |
117 | ||
118 | for (i = 0; i < TX_BD_NUM; i++) { | |
119 | unsigned int *txbd_dirty = &priv->txbd_dirty; | |
120 | struct arc_emac_bd *txbd = &priv->txbd[*txbd_dirty]; | |
121 | struct buffer_state *tx_buff = &priv->tx_buff[*txbd_dirty]; | |
122 | struct sk_buff *skb = tx_buff->skb; | |
123 | unsigned int info = le32_to_cpu(txbd->info); | |
124 | ||
c278c253 | 125 | if ((info & FOR_EMAC) || !txbd->data || !skb) |
e4f2379d AB |
126 | break; |
127 | ||
128 | if (unlikely(info & (DROP | DEFR | LTCL | UFLO))) { | |
129 | stats->tx_errors++; | |
130 | stats->tx_dropped++; | |
131 | ||
132 | if (info & DEFR) | |
133 | stats->tx_carrier_errors++; | |
134 | ||
135 | if (info & LTCL) | |
136 | stats->collisions++; | |
137 | ||
138 | if (info & UFLO) | |
139 | stats->tx_fifo_errors++; | |
140 | } else if (likely(info & FIRST_OR_LAST_MASK)) { | |
141 | stats->tx_packets++; | |
142 | stats->tx_bytes += skb->len; | |
143 | } | |
144 | ||
a4a1139b AB |
145 | dma_unmap_single(&ndev->dev, dma_unmap_addr(tx_buff, addr), |
146 | dma_unmap_len(tx_buff, len), DMA_TO_DEVICE); | |
e4f2379d AB |
147 | |
148 | /* return the sk_buff to system */ | |
149 | dev_kfree_skb_irq(skb); | |
150 | ||
151 | txbd->data = 0; | |
152 | txbd->info = 0; | |
c278c253 | 153 | tx_buff->skb = NULL; |
e4f2379d | 154 | |
27082ee1 | 155 | *txbd_dirty = (*txbd_dirty + 1) % TX_BD_NUM; |
e4f2379d | 156 | } |
74dd40bc BG |
157 | |
158 | /* Ensure that txbd_dirty is visible to tx() before checking | |
159 | * for queue stopped. | |
160 | */ | |
161 | smp_mb(); | |
162 | ||
163 | if (netif_queue_stopped(ndev) && arc_emac_tx_avail(priv)) | |
164 | netif_wake_queue(ndev); | |
e4f2379d AB |
165 | } |
166 | ||
167 | /** | |
168 | * arc_emac_rx - processing of Rx packets. | |
169 | * @ndev: Pointer to the network device. | |
170 | * @budget: How many BDs to process on 1 call. | |
171 | * | |
172 | * returns: Number of processed BDs | |
173 | * | |
174 | * Iterate through Rx BDs and deliver received packages to upper layer. | |
175 | */ | |
176 | static int arc_emac_rx(struct net_device *ndev, int budget) | |
177 | { | |
178 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
179 | unsigned int work_done; | |
180 | ||
9cff866e | 181 | for (work_done = 0; work_done < budget; work_done++) { |
e4f2379d | 182 | unsigned int *last_rx_bd = &priv->last_rx_bd; |
ff458f6f | 183 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
184 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; |
185 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
e4f2379d AB |
186 | unsigned int pktlen, info = le32_to_cpu(rxbd->info); |
187 | struct sk_buff *skb; | |
188 | dma_addr_t addr; | |
189 | ||
190 | if (unlikely((info & OWN_MASK) == FOR_EMAC)) | |
191 | break; | |
192 | ||
193 | /* Make a note that we saw a packet at this BD. | |
194 | * So next time, driver starts from this + 1 | |
195 | */ | |
196 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; | |
197 | ||
198 | if (unlikely((info & FIRST_OR_LAST_MASK) != | |
199 | FIRST_OR_LAST_MASK)) { | |
200 | /* We pre-allocate buffers of MTU size so incoming | |
201 | * packets won't be split/chained. | |
202 | */ | |
203 | if (net_ratelimit()) | |
204 | netdev_err(ndev, "incomplete packet received\n"); | |
205 | ||
206 | /* Return ownership to EMAC */ | |
a4a1139b | 207 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
208 | stats->rx_errors++; |
209 | stats->rx_length_errors++; | |
210 | continue; | |
211 | } | |
212 | ||
213 | pktlen = info & LEN_MASK; | |
214 | stats->rx_packets++; | |
215 | stats->rx_bytes += pktlen; | |
216 | skb = rx_buff->skb; | |
217 | skb_put(skb, pktlen); | |
218 | skb->dev = ndev; | |
219 | skb->protocol = eth_type_trans(skb, ndev); | |
220 | ||
a4a1139b AB |
221 | dma_unmap_single(&ndev->dev, dma_unmap_addr(rx_buff, addr), |
222 | dma_unmap_len(rx_buff, len), DMA_FROM_DEVICE); | |
e4f2379d AB |
223 | |
224 | /* Prepare the BD for next cycle */ | |
a4a1139b AB |
225 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, |
226 | EMAC_BUFFER_SIZE); | |
e4f2379d AB |
227 | if (unlikely(!rx_buff->skb)) { |
228 | stats->rx_errors++; | |
229 | /* Because receive_skb is below, increment rx_dropped */ | |
230 | stats->rx_dropped++; | |
231 | continue; | |
232 | } | |
233 | ||
234 | /* receive_skb only if new skb was allocated to avoid holes */ | |
235 | netif_receive_skb(skb); | |
236 | ||
237 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
a4a1139b | 238 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); |
e4f2379d AB |
239 | if (dma_mapping_error(&ndev->dev, addr)) { |
240 | if (net_ratelimit()) | |
241 | netdev_err(ndev, "cannot dma map\n"); | |
242 | dev_kfree_skb(rx_buff->skb); | |
243 | stats->rx_errors++; | |
244 | continue; | |
245 | } | |
a4a1139b AB |
246 | dma_unmap_addr_set(rx_buff, addr, addr); |
247 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 248 | |
a4a1139b | 249 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
250 | |
251 | /* Make sure pointer to data buffer is set */ | |
252 | wmb(); | |
253 | ||
254 | /* Return ownership to EMAC */ | |
a4a1139b | 255 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); |
e4f2379d AB |
256 | } |
257 | ||
258 | return work_done; | |
259 | } | |
260 | ||
261 | /** | |
262 | * arc_emac_poll - NAPI poll handler. | |
263 | * @napi: Pointer to napi_struct structure. | |
264 | * @budget: How many BDs to process on 1 call. | |
265 | * | |
266 | * returns: Number of processed BDs | |
267 | */ | |
268 | static int arc_emac_poll(struct napi_struct *napi, int budget) | |
269 | { | |
270 | struct net_device *ndev = napi->dev; | |
271 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
272 | unsigned int work_done; | |
273 | ||
274 | arc_emac_tx_clean(ndev); | |
275 | ||
276 | work_done = arc_emac_rx(ndev, budget); | |
277 | if (work_done < budget) { | |
278 | napi_complete(napi); | |
7ce7679d | 279 | arc_reg_or(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
280 | } |
281 | ||
282 | return work_done; | |
283 | } | |
284 | ||
285 | /** | |
286 | * arc_emac_intr - Global interrupt handler for EMAC. | |
287 | * @irq: irq number. | |
288 | * @dev_instance: device instance. | |
289 | * | |
290 | * returns: IRQ_HANDLED for all cases. | |
291 | * | |
292 | * ARC EMAC has only 1 interrupt line, and depending on bits raised in | |
293 | * STATUS register we may tell what is a reason for interrupt to fire. | |
294 | */ | |
295 | static irqreturn_t arc_emac_intr(int irq, void *dev_instance) | |
296 | { | |
297 | struct net_device *ndev = dev_instance; | |
298 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 299 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
300 | unsigned int status; |
301 | ||
302 | status = arc_reg_get(priv, R_STATUS); | |
303 | status &= ~MDIO_MASK; | |
304 | ||
305 | /* Reset all flags except "MDIO complete" */ | |
306 | arc_reg_set(priv, R_STATUS, status); | |
307 | ||
7ce7679d | 308 | if (status & (RXINT_MASK | TXINT_MASK)) { |
e4f2379d | 309 | if (likely(napi_schedule_prep(&priv->napi))) { |
7ce7679d | 310 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK); |
e4f2379d AB |
311 | __napi_schedule(&priv->napi); |
312 | } | |
313 | } | |
314 | ||
315 | if (status & ERR_MASK) { | |
316 | /* MSER/RXCR/RXFR/RXFL interrupt fires on corresponding | |
317 | * 8-bit error counter overrun. | |
318 | */ | |
319 | ||
320 | if (status & MSER_MASK) { | |
321 | stats->rx_missed_errors += 0x100; | |
322 | stats->rx_errors += 0x100; | |
323 | } | |
324 | ||
325 | if (status & RXCR_MASK) { | |
326 | stats->rx_crc_errors += 0x100; | |
327 | stats->rx_errors += 0x100; | |
328 | } | |
329 | ||
330 | if (status & RXFR_MASK) { | |
331 | stats->rx_frame_errors += 0x100; | |
332 | stats->rx_errors += 0x100; | |
333 | } | |
334 | ||
335 | if (status & RXFL_MASK) { | |
336 | stats->rx_over_errors += 0x100; | |
337 | stats->rx_errors += 0x100; | |
338 | } | |
339 | } | |
340 | ||
341 | return IRQ_HANDLED; | |
342 | } | |
343 | ||
5a45e57a BG |
344 | #ifdef CONFIG_NET_POLL_CONTROLLER |
345 | static void arc_emac_poll_controller(struct net_device *dev) | |
346 | { | |
347 | disable_irq(dev->irq); | |
348 | arc_emac_intr(dev->irq, dev); | |
349 | enable_irq(dev->irq); | |
350 | } | |
351 | #endif | |
352 | ||
e4f2379d AB |
353 | /** |
354 | * arc_emac_open - Open the network device. | |
355 | * @ndev: Pointer to the network device. | |
356 | * | |
357 | * returns: 0, on success or non-zero error value on failure. | |
358 | * | |
359 | * This function sets the MAC address, requests and enables an IRQ | |
360 | * for the EMAC device and starts the Tx queue. | |
361 | * It also connects to the phy device. | |
362 | */ | |
363 | static int arc_emac_open(struct net_device *ndev) | |
364 | { | |
365 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
01dea536 | 366 | struct phy_device *phy_dev = ndev->phydev; |
e4f2379d AB |
367 | int i; |
368 | ||
369 | phy_dev->autoneg = AUTONEG_ENABLE; | |
370 | phy_dev->speed = 0; | |
371 | phy_dev->duplex = 0; | |
b0ac9564 | 372 | phy_dev->advertising &= phy_dev->supported; |
e4f2379d | 373 | |
a4a1139b AB |
374 | priv->last_rx_bd = 0; |
375 | ||
e4f2379d | 376 | /* Allocate and set buffers for Rx BD's */ |
e4f2379d | 377 | for (i = 0; i < RX_BD_NUM; i++) { |
a4a1139b AB |
378 | dma_addr_t addr; |
379 | unsigned int *last_rx_bd = &priv->last_rx_bd; | |
380 | struct arc_emac_bd *rxbd = &priv->rxbd[*last_rx_bd]; | |
381 | struct buffer_state *rx_buff = &priv->rx_buff[*last_rx_bd]; | |
382 | ||
383 | rx_buff->skb = netdev_alloc_skb_ip_align(ndev, | |
384 | EMAC_BUFFER_SIZE); | |
385 | if (unlikely(!rx_buff->skb)) | |
386 | return -ENOMEM; | |
387 | ||
388 | addr = dma_map_single(&ndev->dev, (void *)rx_buff->skb->data, | |
389 | EMAC_BUFFER_SIZE, DMA_FROM_DEVICE); | |
390 | if (dma_mapping_error(&ndev->dev, addr)) { | |
391 | netdev_err(ndev, "cannot dma map\n"); | |
392 | dev_kfree_skb(rx_buff->skb); | |
e4f2379d | 393 | return -ENOMEM; |
a4a1139b AB |
394 | } |
395 | dma_unmap_addr_set(rx_buff, addr, addr); | |
396 | dma_unmap_len_set(rx_buff, len, EMAC_BUFFER_SIZE); | |
e4f2379d | 397 | |
a4a1139b | 398 | rxbd->data = cpu_to_le32(addr); |
e4f2379d AB |
399 | |
400 | /* Make sure pointer to data buffer is set */ | |
401 | wmb(); | |
402 | ||
a4a1139b AB |
403 | /* Return ownership to EMAC */ |
404 | rxbd->info = cpu_to_le32(FOR_EMAC | EMAC_BUFFER_SIZE); | |
e4f2379d | 405 | |
a4a1139b AB |
406 | *last_rx_bd = (*last_rx_bd + 1) % RX_BD_NUM; |
407 | } | |
e4f2379d | 408 | |
99f93a15 AK |
409 | priv->txbd_curr = 0; |
410 | priv->txbd_dirty = 0; | |
411 | ||
e4f2379d AB |
412 | /* Clean Tx BD's */ |
413 | memset(priv->txbd, 0, TX_RING_SZ); | |
414 | ||
415 | /* Initialize logical address filter */ | |
416 | arc_reg_set(priv, R_LAFL, 0); | |
417 | arc_reg_set(priv, R_LAFH, 0); | |
418 | ||
419 | /* Set BD ring pointers for device side */ | |
420 | arc_reg_set(priv, R_RX_RING, (unsigned int)priv->rxbd_dma); | |
421 | arc_reg_set(priv, R_TX_RING, (unsigned int)priv->txbd_dma); | |
422 | ||
423 | /* Enable interrupts */ | |
7ce7679d | 424 | arc_reg_set(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
425 | |
426 | /* Set CONTROL */ | |
427 | arc_reg_set(priv, R_CTRL, | |
663713eb CW |
428 | (RX_BD_NUM << 24) | /* RX BD table length */ |
429 | (TX_BD_NUM << 16) | /* TX BD table length */ | |
430 | TXRN_MASK | RXRN_MASK); | |
e4f2379d AB |
431 | |
432 | napi_enable(&priv->napi); | |
433 | ||
434 | /* Enable EMAC */ | |
435 | arc_reg_or(priv, R_CTRL, EN_MASK); | |
436 | ||
01dea536 | 437 | phy_start_aneg(ndev->phydev); |
e4f2379d AB |
438 | |
439 | netif_start_queue(ndev); | |
440 | ||
441 | return 0; | |
442 | } | |
443 | ||
775dd682 BG |
444 | /** |
445 | * arc_emac_set_rx_mode - Change the receive filtering mode. | |
446 | * @ndev: Pointer to the network device. | |
447 | * | |
448 | * This function enables/disables promiscuous or all-multicast mode | |
449 | * and updates the multicast filtering list of the network device. | |
450 | */ | |
451 | static void arc_emac_set_rx_mode(struct net_device *ndev) | |
452 | { | |
453 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
454 | ||
455 | if (ndev->flags & IFF_PROMISC) { | |
456 | arc_reg_or(priv, R_CTRL, PROM_MASK); | |
457 | } else { | |
458 | arc_reg_clr(priv, R_CTRL, PROM_MASK); | |
459 | ||
460 | if (ndev->flags & IFF_ALLMULTI) { | |
461 | arc_reg_set(priv, R_LAFL, ~0); | |
462 | arc_reg_set(priv, R_LAFH, ~0); | |
463 | } else { | |
464 | struct netdev_hw_addr *ha; | |
465 | unsigned int filter[2] = { 0, 0 }; | |
466 | int bit; | |
467 | ||
468 | netdev_for_each_mc_addr(ha, ndev) { | |
469 | bit = ether_crc_le(ETH_ALEN, ha->addr) >> 26; | |
470 | filter[bit >> 5] |= 1 << (bit & 31); | |
471 | } | |
472 | ||
473 | arc_reg_set(priv, R_LAFL, filter[0]); | |
474 | arc_reg_set(priv, R_LAFH, filter[1]); | |
475 | } | |
476 | } | |
477 | } | |
478 | ||
b530b164 AK |
479 | /** |
480 | * arc_free_tx_queue - free skb from tx queue | |
481 | * @ndev: Pointer to the network device. | |
482 | * | |
483 | * This function must be called while EMAC disable | |
484 | */ | |
485 | static void arc_free_tx_queue(struct net_device *ndev) | |
486 | { | |
487 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
488 | unsigned int i; | |
489 | ||
490 | for (i = 0; i < TX_BD_NUM; i++) { | |
491 | struct arc_emac_bd *txbd = &priv->txbd[i]; | |
492 | struct buffer_state *tx_buff = &priv->tx_buff[i]; | |
493 | ||
494 | if (tx_buff->skb) { | |
663713eb CW |
495 | dma_unmap_single(&ndev->dev, |
496 | dma_unmap_addr(tx_buff, addr), | |
497 | dma_unmap_len(tx_buff, len), | |
498 | DMA_TO_DEVICE); | |
b530b164 AK |
499 | |
500 | /* return the sk_buff to system */ | |
501 | dev_kfree_skb_irq(tx_buff->skb); | |
502 | } | |
503 | ||
504 | txbd->info = 0; | |
505 | txbd->data = 0; | |
506 | tx_buff->skb = NULL; | |
507 | } | |
508 | } | |
509 | ||
510 | /** | |
511 | * arc_free_rx_queue - free skb from rx queue | |
512 | * @ndev: Pointer to the network device. | |
513 | * | |
514 | * This function must be called while EMAC disable | |
515 | */ | |
516 | static void arc_free_rx_queue(struct net_device *ndev) | |
517 | { | |
518 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
519 | unsigned int i; | |
520 | ||
521 | for (i = 0; i < RX_BD_NUM; i++) { | |
522 | struct arc_emac_bd *rxbd = &priv->rxbd[i]; | |
523 | struct buffer_state *rx_buff = &priv->rx_buff[i]; | |
524 | ||
525 | if (rx_buff->skb) { | |
663713eb CW |
526 | dma_unmap_single(&ndev->dev, |
527 | dma_unmap_addr(rx_buff, addr), | |
528 | dma_unmap_len(rx_buff, len), | |
529 | DMA_FROM_DEVICE); | |
b530b164 AK |
530 | |
531 | /* return the sk_buff to system */ | |
532 | dev_kfree_skb_irq(rx_buff->skb); | |
533 | } | |
534 | ||
535 | rxbd->info = 0; | |
536 | rxbd->data = 0; | |
537 | rx_buff->skb = NULL; | |
538 | } | |
539 | } | |
540 | ||
e4f2379d AB |
541 | /** |
542 | * arc_emac_stop - Close the network device. | |
543 | * @ndev: Pointer to the network device. | |
544 | * | |
545 | * This function stops the Tx queue, disables interrupts and frees the IRQ for | |
546 | * the EMAC device. | |
547 | * It also disconnects the PHY device associated with the EMAC device. | |
548 | */ | |
549 | static int arc_emac_stop(struct net_device *ndev) | |
550 | { | |
551 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
552 | ||
553 | napi_disable(&priv->napi); | |
554 | netif_stop_queue(ndev); | |
555 | ||
556 | /* Disable interrupts */ | |
7ce7679d | 557 | arc_reg_clr(priv, R_ENABLE, RXINT_MASK | TXINT_MASK | ERR_MASK); |
e4f2379d AB |
558 | |
559 | /* Disable EMAC */ | |
560 | arc_reg_clr(priv, R_CTRL, EN_MASK); | |
561 | ||
b530b164 AK |
562 | /* Return the sk_buff to system */ |
563 | arc_free_tx_queue(ndev); | |
564 | arc_free_rx_queue(ndev); | |
565 | ||
e4f2379d AB |
566 | return 0; |
567 | } | |
568 | ||
569 | /** | |
570 | * arc_emac_stats - Get system network statistics. | |
571 | * @ndev: Pointer to net_device structure. | |
572 | * | |
573 | * Returns the address of the device statistics structure. | |
574 | * Statistics are updated in interrupt handler. | |
575 | */ | |
576 | static struct net_device_stats *arc_emac_stats(struct net_device *ndev) | |
577 | { | |
578 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
ff458f6f | 579 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
580 | unsigned long miss, rxerr; |
581 | u8 rxcrc, rxfram, rxoflow; | |
582 | ||
583 | rxerr = arc_reg_get(priv, R_RXERR); | |
584 | miss = arc_reg_get(priv, R_MISS); | |
585 | ||
586 | rxcrc = rxerr; | |
587 | rxfram = rxerr >> 8; | |
588 | rxoflow = rxerr >> 16; | |
589 | ||
590 | stats->rx_errors += miss; | |
591 | stats->rx_errors += rxcrc + rxfram + rxoflow; | |
592 | ||
593 | stats->rx_over_errors += rxoflow; | |
594 | stats->rx_frame_errors += rxfram; | |
595 | stats->rx_crc_errors += rxcrc; | |
596 | stats->rx_missed_errors += miss; | |
597 | ||
598 | return stats; | |
599 | } | |
600 | ||
601 | /** | |
602 | * arc_emac_tx - Starts the data transmission. | |
603 | * @skb: sk_buff pointer that contains data to be Transmitted. | |
604 | * @ndev: Pointer to net_device structure. | |
605 | * | |
606 | * returns: NETDEV_TX_OK, on success | |
607 | * NETDEV_TX_BUSY, if any of the descriptors are not free. | |
608 | * | |
609 | * This function is invoked from upper layers to initiate transmission. | |
610 | */ | |
611 | static int arc_emac_tx(struct sk_buff *skb, struct net_device *ndev) | |
612 | { | |
613 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
614 | unsigned int len, *txbd_curr = &priv->txbd_curr; | |
ff458f6f | 615 | struct net_device_stats *stats = &ndev->stats; |
e4f2379d AB |
616 | __le32 *info = &priv->txbd[*txbd_curr].info; |
617 | dma_addr_t addr; | |
618 | ||
619 | if (skb_padto(skb, ETH_ZLEN)) | |
620 | return NETDEV_TX_OK; | |
621 | ||
622 | len = max_t(unsigned int, ETH_ZLEN, skb->len); | |
623 | ||
74dd40bc | 624 | if (unlikely(!arc_emac_tx_avail(priv))) { |
e4f2379d | 625 | netif_stop_queue(ndev); |
74dd40bc | 626 | netdev_err(ndev, "BUG! Tx Ring full when queue awake!\n"); |
e4f2379d AB |
627 | return NETDEV_TX_BUSY; |
628 | } | |
629 | ||
630 | addr = dma_map_single(&ndev->dev, (void *)skb->data, len, | |
631 | DMA_TO_DEVICE); | |
632 | ||
633 | if (unlikely(dma_mapping_error(&ndev->dev, addr))) { | |
634 | stats->tx_dropped++; | |
635 | stats->tx_errors++; | |
636 | dev_kfree_skb(skb); | |
637 | return NETDEV_TX_OK; | |
638 | } | |
a4a1139b | 639 | dma_unmap_addr_set(&priv->tx_buff[*txbd_curr], addr, addr); |
e4f2379d AB |
640 | dma_unmap_len_set(&priv->tx_buff[*txbd_curr], len, len); |
641 | ||
a4a1139b | 642 | priv->txbd[*txbd_curr].data = cpu_to_le32(addr); |
e4f2379d AB |
643 | |
644 | /* Make sure pointer to data buffer is set */ | |
645 | wmb(); | |
646 | ||
37ec274e ED |
647 | skb_tx_timestamp(skb); |
648 | ||
e4f2379d AB |
649 | *info = cpu_to_le32(FOR_EMAC | FIRST_OR_LAST_MASK | len); |
650 | ||
c278c253 AK |
651 | /* Make sure info word is set */ |
652 | wmb(); | |
653 | ||
654 | priv->tx_buff[*txbd_curr].skb = skb; | |
655 | ||
e4f2379d AB |
656 | /* Increment index to point to the next BD */ |
657 | *txbd_curr = (*txbd_curr + 1) % TX_BD_NUM; | |
658 | ||
74dd40bc BG |
659 | /* Ensure that tx_clean() sees the new txbd_curr before |
660 | * checking the queue status. This prevents an unneeded wake | |
661 | * of the queue in tx_clean(). | |
662 | */ | |
663 | smp_mb(); | |
e4f2379d | 664 | |
74dd40bc | 665 | if (!arc_emac_tx_avail(priv)) { |
e4f2379d | 666 | netif_stop_queue(ndev); |
74dd40bc BG |
667 | /* Refresh tx_dirty */ |
668 | smp_mb(); | |
669 | if (arc_emac_tx_avail(priv)) | |
670 | netif_start_queue(ndev); | |
671 | } | |
e4f2379d AB |
672 | |
673 | arc_reg_set(priv, R_STATUS, TXPL_MASK); | |
674 | ||
e4f2379d AB |
675 | return NETDEV_TX_OK; |
676 | } | |
677 | ||
235a251a MS |
678 | static void arc_emac_set_address_internal(struct net_device *ndev) |
679 | { | |
680 | struct arc_emac_priv *priv = netdev_priv(ndev); | |
681 | unsigned int addr_low, addr_hi; | |
682 | ||
663713eb CW |
683 | addr_low = le32_to_cpu(*(__le32 *)&ndev->dev_addr[0]); |
684 | addr_hi = le16_to_cpu(*(__le16 *)&ndev->dev_addr[4]); | |
235a251a MS |
685 | |
686 | arc_reg_set(priv, R_ADDRL, addr_low); | |
687 | arc_reg_set(priv, R_ADDRH, addr_hi); | |
688 | } | |
689 | ||
e4f2379d AB |
690 | /** |
691 | * arc_emac_set_address - Set the MAC address for this device. | |
692 | * @ndev: Pointer to net_device structure. | |
693 | * @p: 6 byte Address to be written as MAC address. | |
694 | * | |
695 | * This function copies the HW address from the sockaddr structure to the | |
696 | * net_device structure and updates the address in HW. | |
697 | * | |
698 | * returns: -EBUSY if the net device is busy or 0 if the address is set | |
699 | * successfully. | |
700 | */ | |
701 | static int arc_emac_set_address(struct net_device *ndev, void *p) | |
702 | { | |
e4f2379d | 703 | struct sockaddr *addr = p; |
e4f2379d AB |
704 | |
705 | if (netif_running(ndev)) | |
706 | return -EBUSY; | |
707 | ||
708 | if (!is_valid_ether_addr(addr->sa_data)) | |
709 | return -EADDRNOTAVAIL; | |
710 | ||
711 | memcpy(ndev->dev_addr, addr->sa_data, ndev->addr_len); | |
712 | ||
235a251a | 713 | arc_emac_set_address_internal(ndev); |
e4f2379d AB |
714 | |
715 | return 0; | |
716 | } | |
717 | ||
718 | static const struct net_device_ops arc_emac_netdev_ops = { | |
719 | .ndo_open = arc_emac_open, | |
720 | .ndo_stop = arc_emac_stop, | |
721 | .ndo_start_xmit = arc_emac_tx, | |
722 | .ndo_set_mac_address = arc_emac_set_address, | |
723 | .ndo_get_stats = arc_emac_stats, | |
775dd682 | 724 | .ndo_set_rx_mode = arc_emac_set_rx_mode, |
5a45e57a BG |
725 | #ifdef CONFIG_NET_POLL_CONTROLLER |
726 | .ndo_poll_controller = arc_emac_poll_controller, | |
727 | #endif | |
e4f2379d AB |
728 | }; |
729 | ||
23d2d9a6 | 730 | int arc_emac_probe(struct net_device *ndev, int interface) |
e4f2379d | 731 | { |
23d2d9a6 | 732 | struct device *dev = ndev->dev.parent; |
f7578496 | 733 | struct resource res_regs; |
e4f2379d | 734 | struct device_node *phy_node; |
01dea536 | 735 | struct phy_device *phydev = NULL; |
e4f2379d | 736 | struct arc_emac_priv *priv; |
e4f2379d | 737 | const char *mac_addr; |
f7578496 | 738 | unsigned int id, clock_frequency, irq; |
e4f2379d AB |
739 | int err; |
740 | ||
e4f2379d | 741 | /* Get PHY from device tree */ |
f15f44e0 | 742 | phy_node = of_parse_phandle(dev->of_node, "phy", 0); |
e4f2379d | 743 | if (!phy_node) { |
f15f44e0 | 744 | dev_err(dev, "failed to retrieve phy description from device tree\n"); |
e4f2379d AB |
745 | return -ENODEV; |
746 | } | |
747 | ||
748 | /* Get EMAC registers base address from device tree */ | |
f15f44e0 | 749 | err = of_address_to_resource(dev->of_node, 0, &res_regs); |
e4f2379d | 750 | if (err) { |
f15f44e0 | 751 | dev_err(dev, "failed to retrieve registers base from device tree\n"); |
e4f2379d AB |
752 | return -ENODEV; |
753 | } | |
754 | ||
e4f2379d | 755 | /* Get IRQ from device tree */ |
f15f44e0 | 756 | irq = irq_of_parse_and_map(dev->of_node, 0); |
f7578496 | 757 | if (!irq) { |
f15f44e0 | 758 | dev_err(dev, "failed to retrieve <irq> value from device tree\n"); |
e4f2379d AB |
759 | return -ENODEV; |
760 | } | |
761 | ||
e4f2379d AB |
762 | ndev->netdev_ops = &arc_emac_netdev_ops; |
763 | ndev->ethtool_ops = &arc_emac_ethtool_ops; | |
764 | ndev->watchdog_timeo = TX_TIMEOUT; | |
765 | /* FIXME :: no multicast support yet */ | |
766 | ndev->flags &= ~IFF_MULTICAST; | |
767 | ||
768 | priv = netdev_priv(ndev); | |
f15f44e0 | 769 | priv->dev = dev; |
e4f2379d | 770 | |
f15f44e0 | 771 | priv->regs = devm_ioremap_resource(dev, &res_regs); |
663713eb | 772 | if (IS_ERR(priv->regs)) |
23d2d9a6 | 773 | return PTR_ERR(priv->regs); |
663713eb | 774 | |
f15f44e0 | 775 | dev_dbg(dev, "Registers base address is 0x%p\n", priv->regs); |
e4f2379d | 776 | |
23d2d9a6 | 777 | if (priv->clk) { |
88154c96 HS |
778 | err = clk_prepare_enable(priv->clk); |
779 | if (err) { | |
f15f44e0 | 780 | dev_err(dev, "failed to enable clock\n"); |
23d2d9a6 | 781 | return err; |
88154c96 HS |
782 | } |
783 | ||
784 | clock_frequency = clk_get_rate(priv->clk); | |
23d2d9a6 RP |
785 | } else { |
786 | /* Get CPU clock frequency from device tree */ | |
787 | if (of_property_read_u32(dev->of_node, "clock-frequency", | |
788 | &clock_frequency)) { | |
789 | dev_err(dev, "failed to retrieve <clock-frequency> from device tree\n"); | |
790 | return -EINVAL; | |
791 | } | |
88154c96 HS |
792 | } |
793 | ||
e4f2379d AB |
794 | id = arc_reg_get(priv, R_ID); |
795 | ||
796 | /* Check for EMAC revision 5 or 7, magic number */ | |
797 | if (!(id == 0x0005fd02 || id == 0x0007fd02)) { | |
f15f44e0 | 798 | dev_err(dev, "ARC EMAC not detected, id=0x%x\n", id); |
e4f2379d | 799 | err = -ENODEV; |
88154c96 | 800 | goto out_clken; |
e4f2379d | 801 | } |
f15f44e0 | 802 | dev_info(dev, "ARC EMAC detected with id: 0x%x\n", id); |
e4f2379d AB |
803 | |
804 | /* Set poll rate so that it polls every 1 ms */ | |
805 | arc_reg_set(priv, R_POLLRATE, clock_frequency / 1000000); | |
806 | ||
f7578496 | 807 | ndev->irq = irq; |
f15f44e0 | 808 | dev_info(dev, "IRQ is %d\n", ndev->irq); |
e4f2379d AB |
809 | |
810 | /* Register interrupt handler for device */ | |
f15f44e0 | 811 | err = devm_request_irq(dev, ndev->irq, arc_emac_intr, 0, |
e4f2379d AB |
812 | ndev->name, ndev); |
813 | if (err) { | |
f15f44e0 | 814 | dev_err(dev, "could not allocate IRQ\n"); |
88154c96 | 815 | goto out_clken; |
e4f2379d AB |
816 | } |
817 | ||
818 | /* Get MAC address from device tree */ | |
f15f44e0 | 819 | mac_addr = of_get_mac_address(dev->of_node); |
e4f2379d | 820 | |
99470819 | 821 | if (mac_addr) |
e4f2379d | 822 | memcpy(ndev->dev_addr, mac_addr, ETH_ALEN); |
99470819 LP |
823 | else |
824 | eth_hw_addr_random(ndev); | |
e4f2379d | 825 | |
235a251a | 826 | arc_emac_set_address_internal(ndev); |
f15f44e0 | 827 | dev_info(dev, "MAC address is now %pM\n", ndev->dev_addr); |
e4f2379d AB |
828 | |
829 | /* Do 1 allocation instead of 2 separate ones for Rx and Tx BD rings */ | |
f15f44e0 | 830 | priv->rxbd = dmam_alloc_coherent(dev, RX_RING_SZ + TX_RING_SZ, |
e4f2379d AB |
831 | &priv->rxbd_dma, GFP_KERNEL); |
832 | ||
833 | if (!priv->rxbd) { | |
f15f44e0 | 834 | dev_err(dev, "failed to allocate data buffers\n"); |
e4f2379d | 835 | err = -ENOMEM; |
88154c96 | 836 | goto out_clken; |
e4f2379d AB |
837 | } |
838 | ||
839 | priv->txbd = priv->rxbd + RX_BD_NUM; | |
840 | ||
841 | priv->txbd_dma = priv->rxbd_dma + RX_RING_SZ; | |
f15f44e0 | 842 | dev_dbg(dev, "EMAC Device addr: Rx Ring [0x%x], Tx Ring[%x]\n", |
e4f2379d AB |
843 | (unsigned int)priv->rxbd_dma, (unsigned int)priv->txbd_dma); |
844 | ||
93e91b3d | 845 | err = arc_mdio_probe(priv); |
e4f2379d | 846 | if (err) { |
f15f44e0 | 847 | dev_err(dev, "failed to probe MII bus\n"); |
88154c96 | 848 | goto out_clken; |
e4f2379d AB |
849 | } |
850 | ||
01dea536 PR |
851 | phydev = of_phy_connect(ndev, phy_node, arc_emac_adjust_link, 0, |
852 | interface); | |
853 | if (!phydev) { | |
f15f44e0 | 854 | dev_err(dev, "of_phy_connect() failed\n"); |
e4f2379d | 855 | err = -ENODEV; |
796bec1e | 856 | goto out_mdio; |
e4f2379d AB |
857 | } |
858 | ||
f15f44e0 | 859 | dev_info(dev, "connected to %s phy with id 0x%x\n", |
01dea536 | 860 | phydev->drv->name, phydev->phy_id); |
e4f2379d AB |
861 | |
862 | netif_napi_add(ndev, &priv->napi, arc_emac_poll, ARC_EMAC_NAPI_WEIGHT); | |
863 | ||
864 | err = register_netdev(ndev); | |
865 | if (err) { | |
f15f44e0 | 866 | dev_err(dev, "failed to register network device\n"); |
796bec1e | 867 | goto out_netif_api; |
e4f2379d AB |
868 | } |
869 | ||
870 | return 0; | |
871 | ||
796bec1e HS |
872 | out_netif_api: |
873 | netif_napi_del(&priv->napi); | |
01dea536 | 874 | phy_disconnect(phydev); |
796bec1e HS |
875 | out_mdio: |
876 | arc_mdio_remove(priv); | |
88154c96 | 877 | out_clken: |
23d2d9a6 | 878 | if (priv->clk) |
88154c96 | 879 | clk_disable_unprepare(priv->clk); |
e4f2379d AB |
880 | return err; |
881 | } | |
23d2d9a6 | 882 | EXPORT_SYMBOL_GPL(arc_emac_probe); |
e4f2379d | 883 | |
23d2d9a6 | 884 | int arc_emac_remove(struct net_device *ndev) |
e4f2379d | 885 | { |
e4f2379d AB |
886 | struct arc_emac_priv *priv = netdev_priv(ndev); |
887 | ||
01dea536 | 888 | phy_disconnect(ndev->phydev); |
e4f2379d AB |
889 | arc_mdio_remove(priv); |
890 | unregister_netdev(ndev); | |
891 | netif_napi_del(&priv->napi); | |
88154c96 | 892 | |
663713eb | 893 | if (!IS_ERR(priv->clk)) |
88154c96 | 894 | clk_disable_unprepare(priv->clk); |
e4f2379d AB |
895 | |
896 | return 0; | |
897 | } | |
23d2d9a6 | 898 | EXPORT_SYMBOL_GPL(arc_emac_remove); |
e4f2379d AB |
899 | |
900 | MODULE_AUTHOR("Alexey Brodkin <abrodkin@synopsys.com>"); | |
901 | MODULE_DESCRIPTION("ARC EMAC driver"); | |
902 | MODULE_LICENSE("GPL"); |